Stack-based buffer overflow in BitchX 1.1 Final allows remote IRC
servers to execute arbitrary code via a long string in a MODE
command, related to the p_mode variable.

Nico Golde reports:

There is a security issue in ircii-pana in bitchx' hostname
command. The e_hostname function (commands.c) uses tmpnam to
create a temporary file which is known to be insecure.

Chris reports:

Chris has reported a vulnerability in the Cypress script for
BitchX, which can be exploited by malicious people to disclose
potentially sensitive information or to compromise a vulnerable
system.

The vulnerability is caused due to malicious code being present
in the modules/mdop.m file. This can be exploited to disclose the
content of various system files or to execute arbitrary shell
commands.

Successful exploitation allows execution of arbitrary code, but
requires the control of the "lsyn.webhop.net" domain.